From 18:15 ~ 20:15 on 01.05 , I started the Virtual contest of 'Educational Codeforces Round 56 (Rated for Div. 2)' . 4 problems accepted ; The biggest harvest I have was my gloomy heart on the fourth problem 'D. Beautiful Graph' ; Submitting with 13 times and it accepted finally thanks to my friends CJH ; OH , at last , I'm going to be crazy and blundered . Saying it , I get the ans as soon as I had looked through the title and made it with the codes ; But the reality was that it got 'WA' or 'TLE' every times ; It takes me more than 30 minutes on this problem . Perhaps it will never accepted until the end of the contest without CJH's help . 2 Tips : Only getting the true ans can I then program it ; Even if it is always not accepted I shouldn't make my heart blundering , I should always keep quiet and bright all the time ;

All right , keep going ;